Process for preparing acrylic acid

US9738583B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Marco Hartmann · Jockgrim, DE
• Lukas SCHULZ · Mannheim, DE
• Nicolai Tonio Woerz · Darmstadt, DE
• Yong Liu · Dalian, CN
• Till Christian Brueggemann · Ludwigshafen, DE
• Michael Lejkowski · Neckargemünd, DE
• Johannes Lieberknecht · Schifferstadt, DE

Key dates

• Filing date: Nov 10, 2016
• Grant date: Aug 22, 2017
• Expiry date: Nov 10, 2036

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01J2523/00
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A process for preparing acrylic acid from formaldehyde and acetic acid, is performed by (i) providing a gaseous stream S1 comprising formaldehyde, acetic acid, oxygen and water, where the formaldehyde content of stream S1 is in the range from 8% to 18% by volume, based on the total volume of stream S1, the ratio of the volumes of acetic acid to formaldehyde is in the range from 0.6:1 to 1.1:1, and the molar ratio of oxygen to the total amount of organic carbon is in the range from 0.02:1 to 0.15:1; and (ii) contacting stream S1 with an aldol condensation catalyst in a reaction zone to obtain a gaseous stream S2 containing acrylic acid.